Author: William John TaczakPublisher:
ISBN:
Category : Absorption of sound
Languages : en
Pages : 74
Book Description
A Refined Optical Technique for the Measurement of Ultrasonic Absorption
Author: William John TaczakPublisher:
ISBN:
Category : Absorption of sound
Languages : en
Pages : 74
Book Description
Optical Methods for Studying Ultrasonic Propagation in Transparent Media
Author: Report of NRL Progress
Author: Naval Research Laboratory (U.S.)Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 356
Book Description
Direct Measurement of Ultrasonic Absorption by Thermo-acoustic and Thermo-emissive Techniques
Author: Jean-Pierre MonchalinPublisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
Direct Measurement of Ultrasonic Absorption
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
In section II, the authors recall several properties of heatdiffusion in a periodic regime and introduce the notion ofthermal waves. In section III, an expression is derived for theheat source produced by ultrasonic absorption. Section IVdescribes two thermometric systems and gives the theory of theiroperation. In section V, the authors present severalexperimental results obtained with these types of thermometersand also an experiment demonstrating one use of the technique,namely the measurement of ultrasonic absorption in a Metglasribbon located in a variable magnetic field. Section VIconcludes the first phase of this work and presents brieflypossible future developments.
Direct Measurement of Ultrasonic Absorption by Thermo-acoustic and Thermo-emissive Techniques
Author: Jean-Pierre MonchalinPublisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
Scientific and Technical Aerospace Reports
Author: Optical Measurements
Author: F. MayingerPublisher:
ISBN:
Category : Interferometry
Languages : en
Pages : 488
Book Description
Introduction to optical techniques applied to engineering problems as well as guidelines on the selection and application of the appropriate technique for a particular problem.
An Optoacoustic Technique for Measuring the Optical Absorption Coefficient in Solids
Author: A. HordvikPublisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
An investigation was made of an optoacoustic technique for determining the optical absorption coefficients in solids. A train of laser pulses was passed through the solid, and the amplitude of the acoustic wave generated by the absorbed radiation was measured by a piezoelectric transducer attached directly to the sample. It was shown theoretically and experimentally that the output voltage from the transducer was proportional to the absorbed energy. The generated voltage per unit of absorbed energy was established by measuring the output voltage at a laser wavelength of known absorption coefficient. This value was then used as a reference to determine the abosrption coefficient at other laser wavelengths. Measurements were made on various glasses and potential window materials. Absorption coefficients in the 10 to the -5th power/cm range were measurable with laser input powers of only a few hundred mW. The sensitivity of the technique was limited by the voltage generated by radiation scattered onto the transducer. (Author).
Author: